Mechanics

Orbital Mechanicsis the principles governing motion of bodies in orbit around other bodies under gravitation, as calculated from Newton’s laws of motion.

In classical mechanics, **Newton’s laws of motion** are three laws that describe the relationship between the motion of an object and the forces acting on it.^{[a]} The first law states that an object either remains at rest or continues to move at a constant velocity, unless it is acted upon by an external force.^{[2]}^{[3]} The second law states that the rate of change of momentum of an object is directly proportional to the force applied, or, for an object with constant mass, that the net force on an object is equal to the mass of that object multiplied by the acceleration. The third law states that when one object exerts a force on a second object, that second object exerts a force that is equal in magnitude and opposite in direction on the first object.

The history of how we discovered all the planets in the Solar System https://t.co/pBDo5SfwMi #SolarSystemSunday pic.twitter.com/jdckgQ4fFc

— Massimo (@Rainmaker1973) March 4, 2018

The three laws of motion were first compiled by Isaac Newton in his *Philosophiæ Naturalis Principia Mathematica* (*Mathematical Principles of Natural Philosophy*), first published in 1687.^{[4]} Newton used them to explain and investigate the motion of many physical objects and systems, which laid the foundation for Newtonian mechanics.^{[5]}

**Mach’s Principle**

https://twitter.com/xavierkatana/status/1185391973177483264?s=20

**Orbital**

When plotted geocentrically – from an Earth-centered perspective – there is a highly noticeable rhythm in the motion of Venus. After 8 years, it returns to the same place in the sky on the same date. This is the well known 'cycle of Venus' https://t.co/7B1AuUZxIa pic.twitter.com/550VwWwChR

— Massimo (@Rainmaker1973) April 21, 2018

Lamentations 3:22 The LORD’S loving kindnesses indeed never cease, For His compassions never fail. 23 They are new every morning; Great is Your faithfulness.